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The Shaw 6mm ARC barrel is built for folks who want more reach out of their AR-15 without stepping up to a heavier AR-10 platform. It takes the standard 5.56 receiver you already know and turns it into a flat-shooting long-range setup, running the heavier 6mm bullets the ARC cartridge was designed around. At 18 inches, this is widely considered the sweet spot for the round, giving you strong velocity numbers with heavy ELD-class projectiles while keeping the rifle handy enough to carry and maneuver.
Every Shaw barrel is precision reamed and button rifled, with length and bore diameter held to match-grade tolerances of .0003". This one is cut from 416R stainless steel and finished in a bead-blasted matte that cuts glare in the field. The straight-flute treatment shaves weight and helps the barrel shed heat during longer strings, and it wears an HBAR contour for a solid balance between rigidity and manageable weight. Rifling is a 1-7.5" twist with six grooves, which is exactly what you want to stabilize the long, high-BC bullets the 6mm ARC loves.
The muzzle is threaded 5/8-24, so it drops right into most modern muzzle devices, brakes, and suppressor mounts. It runs a rifle-length gas system with a .750" gas journal that's dimpled and ready for a low-profile gas block, and the extension is set up with a 6.5 Grendel Type II bolt and ARC headspace. Keep in mind the bolt is not included, so you'll want to have a Grendel Type II bolt on hand for your build.
The 6mm ARC was engineered to fill the gap between 5.56 and .308, and it does that job well. With the right ammo you can stay supersonic out past a thousand yards, all while producing noticeably less recoil than a big-bore setup. For hunters, precision plinkers, and anyone chasing steel at distance, this Shaw barrel is a smart foundation for a serious build.
No, the bolt is not included with this barrel. You'll need a 6.5 Grendel Type II bolt to headspace correctly with the ARC chamber. It's a common component and easy to source when putting your build together.
The 18-inch length is generally regarded as the sweet spot for this cartridge, balancing velocity with practical handling. It gives you strong performance with heavy high-BC bullets and keeps the rifle maneuverable. Hornady also points to 18 inches as an optimal length for the round.
The muzzle is threaded 5/8-24, which is the standard for 6mm and larger calibers. That means most brakes, compensators, flash hiders, and suppressor mounts designed for that thread pitch will fit right up. Just match your device to the 5/8-24 pattern and you're good.
The barrel fits a standard AR-15 receiver, but 6mm ARC is not the same as 5.56 when it comes to internal parts. You'll need a 6.5 Grendel Type II bolt and 6mm ARC magazines to run it, since the barrel, bolt, and mags differ from a 5.56 setup. The receiver itself carries over.
| UPC | 810140170194 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AR15HBSSSF186ARC |
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